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Keep in mind... Dropbox IS a backup. It keeps back copies/versions of the files it syncs.
Second... DON'T shut down computers if you can avoid it... I leave all my PCs up and running. (Yes... we have plenty of coal in this country.)
Anyway... as long as you close calibre on a PC when you aren't using it... you should be ok. Dropbox syncs at a block level so it doesn't upload the full 6MBs (if that is the size of the file) it just uploads the change delta which is very small and happens very fast.
BOb
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